Course Cost

If the site has been configured to use an enrolment method
that requires payment (such as the PayPal module), then
you can enter a course cost here with no symbol (the currency
is set by the enrolment plugin). For example, 19.95.

If the cost field is empty then the payment option is not presented
and the interface will fall back to other methods of enrolment
(such as keys, or manual enrolments).

If the cost field is NOT empty, then students trying to enrol will
be presented with the option of making a payment to enter.

If you ALSO enter an enrolment key in the course settings, then
students will also have the option to enrol using a key. This is
useful if you have a mixture of paying and non-paying students.